Imagine the unspeakable fury that would erupt across the Islamic world if a Christian-led government in Khartoum had been responsible for the deaths of hundreds of thousands of Sudanese Muslims over the past 30 years. Or if Christian gunmen were firebombing mosques in Iraq during Friday prayers. Or if Muslim girls in Indonesia had been abducted and beheaded on their way to school, because of their faith.

Such horrors are barely thinkable, of course. But they have all occurred in reverse, with Christians falling victim to Islamist aggression. Only two days ago, a suicide bomber crashed a jeep laden with explosives into a packed Catholic church in Kaduna, northern Nigeria, killing at least eight people and injuring more than 100. The tragedy bore the imprint of numerous similar attacks by Boko Haram (which roughly translates as “Western education is sinful”), an exceptionally bloodthirsty militant group.